Plastic barrel, autofocus module and electronic device

ABSTRACT

A plastic barrel includes an inner portion and an outer portion. The inner portion defines an interior space. The inner portion includes, in order from an object side to an image side, an object-side opening, a plurality of inner annular surfaces and an image-side opening. The interior space is configured for accommodating an imaging lens assembly, and the imaging lens assembly includes a plurality of plastic lens elements. The outer portion surrounds the inner portion. The outer portion includes a mounting structure. The mounting structure is disposed on a surface of the outer portion. The mounting structure is injection molded for mounting a planar conductive element and a wiring element. The mounting structure includes at least three gate traces, and the three gate traces are located on a surface of the mounting structure.

RELATED APPLICATIONS

This application claims priority to Taiwan Application Serial Number107124141, filed Jul. 12, 2018, which is herein incorporated byreference.

BACKGROUND Technical Field

The present disclosure relates to a plastic barrel and an autofocusmodule. More particularly, the present disclosure relates to a plasticbarrel and an autofocus module applicable to an electronic device.

Description of Related Art

With the popularity of personal electronic products and mobilecommunication products having camera functionalities, such as smartphones and tablet personal computers, the demand for compact electronicdevices with high resolution and high image quality also increasessignificantly.

Nowadays, a lens assembly employed in an electronic device normallyadopts a voice coil motor (VCM) as a driving apparatus for providingautofocus function. With an electromagnetic force generated by theinteraction of magnets and a coil, and with the degree of freedom andthe restoring force provided by springs which are required by themovement of the carrier carrying the lens assembly, the carrier isdriven by the voice coil motor to bring the lens assembly to move alonga direction parallel to an optical axis, so that the autofocusfunctionality of the lens assembly can be achieved.

However, the plastic barrel in the conventional lens assembly is proneto the problem of too complicated plastic flow in the mold duringmanufacture, which would enhance the difficulty in injection molding,and is unfavorable for improving yield rate and production efficiency.

SUMMARY

According to one aspect of the present disclosure, a plastic barrelincludes an inner portion and an outer portion. The inner portiondefines an interior space. The inner portion includes, in order from anobject side to an image side, an object-side opening, a plurality ofinner annular surfaces and an image-side opening. The interior space isconfigured for accommodating an imaging lens assembly, and the imaginglens assembly includes a plurality of plastic lens elements. The outerportion surrounds the inner portion. The outer portion includes amounting structure, the mounting structure is disposed on a surface ofthe outer portion, the mounting structure is injection molded formounting a planar conductive element and a wiring element, the mountingstructure includes at least three gate traces, and the three gate tracesare located on a surface of the mounting structure. When a diameter ofthe object-side opening is ϕo, and a diameter of the image-side openingis ϕi, the following condition is satisfied: 0.05<ϕo/ϕi<0.80.

According to another aspect of the present disclosure, an autofocusmodule includes the plastic barrel according to the aforementionedaspect and the imaging lens assembly disposed in the interior space ofthe plastic barrel.

According to another aspect of the present disclosure, an electronicdevice includes the autofocus module according to the aforementionedaspect and an image sensor disposed on an image surface of the imaginglens assembly.

According to another aspect of the present disclosure, a plastic barrelincludes an inner portion and an outer portion. The inner portiondefines an interior space, wherein the inner portion includes, in orderfrom an object side to an image side, an object-side opening, aplurality of inner annular surfaces and an image-side opening, theinterior space is configured for accommodating an imaging lens assembly,and the imaging lens assembly includes a plurality of plastic lenselements. The outer portion surrounds the inner portion, wherein theouter portion includes a mounting structure and at least three gatetraces. The mounting structure is disposed on a surface of the outerportion, wherein the mounting structure is injection molded for mountinga planar conductive element and a wiring element. The mounting structureincludes an annular groove structure, the annular groove structure isdisposed on the surface of the outer portion, and the annular groovestructure is injection molded for mounting the wiring element. The threegate traces are closer to the object-side opening than the annulargroove structure. When a diameter of the object-side opening is ϕo, anda diameter of the image-side opening is ϕi, the following condition issatisfied: 0.05<ϕo/ϕi<0.80.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure can be more fully understood by reading thefollowing detailed description of the embodiment, with reference made tothe accompanying drawings as follows:

FIG. 1 is a three-dimensional view of a plastic barrel according to the1st embodiment of the present disclosure.

FIG. 2 is another three-dimensional view of the plastic barrel of FIG.1.

FIG. 3 is a top view of the plastic barrel of FIG. 1.

FIG. 4 is a bottom view of the plastic barrel of FIG. 1.

FIG. 5 is a cross-sectional view taken along line 5-5 of the plasticbarrel of FIG. 3.

FIG. 6 is a cross-sectional view of the plastic barrel assembled to theimaging lens assembly of FIG. 5.

FIG. 7 is a three-dimensional view of the plastic barrel assembled to aplanar conductive element and a wiring element of FIG. 1.

FIG. 8 is another three-dimensional view of the plastic barrel assembledto the planar conductive element and the wiring element of FIG. 7.

FIG. 9 is a three-dimensional view of a plastic barrel according to the2nd embodiment of the present disclosure.

FIG. 10 is another three-dimensional view of the plastic barrel of FIG.9.

FIG. 11 is a top view of the plastic barrel of FIG. 9.

FIG. 12 is a bottom view of the plastic barrel of FIG. 9.

FIG. 13 is a three-dimensional view of the plastic barrel assembled to aplanar conductive element and a wiring element of FIG. 9.

FIG. 14 is another three-dimensional view of the plastic barrelassembled to the planar conductive element and the wiring element ofFIG. 9.

FIG. 15 is a three-dimensional view of a plastic barrel according to the3rd embodiment of the present disclosure.

FIG. 16 is a top view of the plastic barrel of FIG. 15.

FIG. 17 is a bottom view of the plastic barrel of FIG. 15.

FIG. 18 is a three-dimensional view of an autofocus module according tothe 4th embodiment of the present disclosure.

FIG. 19 is another three-dimensional view of the autofocus module ofFIG. 18.

FIG. 20 is an explored schematic view of the autofocus module of FIG.18.

FIG. 21 is another explored schematic view of the autofocus module ofFIG. 18.

FIG. 22 is a schematic view of an electronic device according to the 5thembodiment of the present disclosure.

FIG. 23 is another schematic view of the electronic device of FIG. 22.

FIG. 24 is a block diagram of the electronic device of FIG. 22.

FIG. 25 is a schematic view of an electronic device according to the 6thembodiment of the present disclosure.

DETAILED DESCRIPTION 1st Embodiment

FIG. 1 is a three-dimensional view of a plastic barrel 100 according tothe 1st embodiment of the present disclosure. FIG. 2 is anotherthree-dimensional view of the plastic barrel 100 of FIG. 1. FIG. 3 is atop view of the plastic barrel 100 of FIG. 1. FIG. 4 is a bottom view ofthe plastic barrel 100 of FIG. 1. FIG. 5 is a cross-sectional view takenalong line 5-5 of the plastic barrel 100 of FIG. 3. In FIG. 1 to FIG. 5,the plastic barrel 100 includes an inner portion 110 and an outerportion 120. The inner portion 110 defines an interior space 111, theinner portion 110 includes, in order from an object side to an imageside, an object-side opening 112, a plurality of inner annular surfaces113 a, 113 b, 113 c, 113 d, 113 e, 113 f and 113 g (as shown in FIG. 5)and an image-side opening 114. The interior space 111 is configured foraccommodating an imaging lens assembly (as shown in FIG. 6), and theimaging lens assembly includes a plurality of plastic lens elements.

The outer portion 120 surrounds the inner portion 110. The outer portion120 includes a mounting structure 121. According to the 1st embodiment,the mounting structure 121 is illustrated with dots in FIG. 1 and FIG.2, which is for easily identifying the mounting structure 121 and themounting structure 121 is illustrated without dot in FIG. 3 to FIG. 8.The mounting structure 121 is disposed on a surface 130 of the outerportion 120, and the mounting structure 121 is injection molded formounting a planar conductive element and a wiring element (as shown inFIG. 7 and FIG. 8). The mounting structure 121 includes at least threegate traces 128 a, 128 b, wherein a number of the gate traces 128 a istwo, a number of the gate traces 128 b is two, and the at least threegate traces 128 a and 128 b are located on a surface (its referencenumeral is omitted) of the mounting structure 121. When a diameter ofthe object-side opening 112 is ϕo, and a diameter of the image-sideopening 114 is (pi, the following condition is satisfied:0.05<ϕo/ϕi<0.80.

With the aforementioned structure, it is favorable for simplifying theflow of the plastic material in a mold so as to reduce the difficulty ofinjection molding and increase the yield rate and the productionefficiency.

Furthermore, according to the present disclosure, the gate traces areformed by removing part of the gate portion during injection molding,and the injection molding is well known in the art which will not bedescribed herein.

In the 1st embodiment, the plastic barrel 100 can be manufactured byinjection molding, and the plastic barrel 100 can be a black singlepiece plastic body which is integrally formed. Specifically, the innerportion 110 and the outer portion 120 are integrally formed on theplastic barrel 100, that is, the mounting structure 121 of the outerportion 120 is also integrally formed on the plastic barrel 100.According to the conventional autofocus module (not shown), whichprovides the lens assembly and the carrier being two independentcomponents, and the metal conductor components, such as the planarconductive element and the wiring element, being disposed on thecarrier. However, the plastic barrel of the present disclosure canaccommodate the imaging lens assembly and the metal conductor componentsat the same time. Therefore, the additional process of assembling theconventional lens assembly with the carrier can be omitted, and canavoid the pollution caused by the aforementioned assembling, and it isfavorable for improving the tolerance of the conventional assembling bythe precision of the mold design so as to improve the assemblingaccuracy.

In the 1st embodiment, the aforementioned black single piece plasticbody can be blended with a chemical fiber or a glass fiber. Therefore,it is favorable for increasing the fluidity of the plastic material soas to improve the molding quality, and when the glass fiber is blended,the structural strength of the plastic barrel 100 can be enhanced.

In the 1st embodiment, the plastic barrel 100 can be a threadlessstructure. Therefore, the complexity of the mold design can be reducedby omitting the thread structure.

FIG. 6 is a cross-sectional view of the plastic barrel 100 assembled tothe imaging lens assembly 450 of FIG. 5. In FIG. 6, the imaging lensassembly 450 includes six plastic lens elements, which are, in orderfrom the object side to the image side, a plastic lens element 451, aplastic lens element 452, a plastic lens element 453, a plastic lenselement 454, a plastic lens element 455, and a plastic lens element 456,and the imaging lens assembly 450 further includes a spacer element 457a, a spacer element 457 b, a spacer element 457 c and a spacer element457 d, the spacer element 457 a is disposed between the plastic lenselement 452 and plastic lens element 453, the spacer element 457 b isdisposed between the plastic lens element 453 and plastic lens element454, the spacer element 457 c is disposed between the plastic lenselement 454 and plastic lens element 455, the spacer element 457 d isdisposed between the plastic lens element 455 and plastic lens element456. As shown in FIG. 5 and FIG. 6, the inner annular surfaces 113 a-113g can be corresponding to the optical elements in the imaging lensassembly 450, that are, the plastic lens element 451-456 and the spacerelements 457 a-457 d. Therefore, it is favorable for directlyaccommodating the imaging lens assembly 450 in the interior space 111 ofthe plastic barrel 100. Furthermore, the imaging lens assembly 450 inthe 1st embodiment is an illustration, and the present disclosure is notlimited thereto. In other embodiments, the configuration of the opticalelements in the imaging lens assembly 450, such as the number, thestructure, and the arrangement of the optical elements, may be adjustedaccording to the desired optical characteristics, and the configurationof the inner annular surfaces of the plastic barrel can be adjustedaccording to the arrangement of the optical elements in the imaging lensassembly 450.

In FIG. 5, when the diameter of the object-side opening 112 is ϕo, andthe diameter of the image-side opening 114 is ϕi, the followingcondition is satisfied: 0.10<ϕo/ϕi<0.60. Therefore, the plastic materialin the mold can flow from the peripheral region to the inner regionalong the radial direction, which is favorable for reducing the disorderof the plastic material flow.

The mounting structure 121 can further include an annular groovestructure 122, the annular groove structure 122 is disposed on thesurface 130 of the outer portion 120. FIG. 7 is a three-dimensional viewof the plastic barrel 100 assembled to a planar conductive element 460and a wiring element 470 of FIG. 1, FIG. 8 is another three-dimensionalview of the plastic barrel 100 assembled to the planar conductiveelement 460 and the wiring element 470 of FIG. 7. As shown in FIG. 7 andFIG. 8, the annular groove structure 122 can be injection molded formounting the wiring element 470, wherein the wiring element 470 can bewound with a wire having an insulating outer layer, such as an enameledwire. Therefore, it is favorable for regularly arranging the wiringelement 470 on the outside of the plastic barrel 100, so as to improvethe focusing efficiency of electromagnetic actuation. In the 1stembodiment, the wiring element 470 is disposed in an assembling methodto the annular groove structure 122.

In FIG. 2 and FIG. 8, the mounting structure 121 further includes afixing structure 127, the fixing structure 127 is adjacent to theannular groove structure 122, and the fixing structure 127 is injectionmolded for mounting the planar conductive element 460. Therefore, it isfavorable for stably assembling the planar conductive element 460 withthe plastic barrel 100 without tilt. In the 1st embodiment, the planarconductive element 460 is an elastic member having two spring piecesseparated from each other. The planar conductive element 460 is disposedin the assembling method to the fixing structure 127.

In FIG. 7 and FIG. 8, the positions of the gate traces 128 a and 128 bin the 1st embodiment would not affect the assembling between themounting structure 121 and the planar conductive element 460, andbetween the mounting structure 121 and the wiring element 470.Therefore, it is favorable for maintaining the compact size improvingthe molding quality of the plastic barrel 100 by the positions of thegate traces 128 a and 128 b.

In FIG. 1, FIG. 2 and FIG. 3, the annular groove structure 122 includesan object-side side wall 123 and an image-side side wall 125, theobject-side side wall 123 is disposed around the surface 130 of theouter portion 120, the image-side side wall 125 is disposed around thesurface 130 of the outer portion 120, the image-side side wall 125 iscorresponding to the object-side side wall 123, and the object-side sidewall 123 includes at least three notches 124. Therefore, it is favorablefor reducing the difficulty of the release by enhancing the smoothnessof the releasing step of the injection molding.

In FIG. 2, the fixing structure 127 is adjacent to the image-side sidewall 125 of the annular groove structure 122, and the image-side sidewall 125 has uneven thickness. The aforementioned “uneven thickness” ofthe image-side side wall 125 means that the image-side side wall 125includes at least two thicknesses; in the 1st embodiment, the image-sideside wall 125 includes a thickness d1 and a thickness d2, wherein thethickness d2 is greater than the thickness d1.

In FIG. 3 and FIG. 4, when twice a shortest distance between the gatetraces 128 a, 128 b and the central axis O of the plastic barrel 100 isϕg (in FIG. 3, ϕg is the twice the shortest distance between the gatetraces 128 b and the central axis O of the plastic barrel 100), and thediameter of the image-side opening 114 is ϕi, the following condition issatisfied: 0.80<ϕg/ϕi<1.40. Therefore, the positions of the gate traces128 a and 128 b are close to the image-side opening 114, which canreduce the disorder of the plastic material flow, so that the plasticmaterial can be naturally filled at the position near the image-sideopening 114, rather than be pushed in a specific direction. Further, thefollowing condition can be satisfied: 1.0<ϕg/ϕi<1.35. Therefore, it isfavorable for achieving a mold cavity design being smooth and withoutruggedness. In the 1st embodiment, the mounting structure 121 includesfour gate traces, which are two gate traces 128 a and two gate traces128 b. The shortest distance between each of the gate traces 128 a andthe central axis O of the plastic barrel 100 is smaller than theshortest distance between each of the gate traces 128 b and the centralaxis O of the plastic barrel 100, as shown in FIG. 3. However, thepresent disclosure is not limited thereto. In other embodiments, thenumber and the position of gate traces can be adjusted on demand.

In FIG. 5, when a diameter of a bottom 126 of the annular groovestructure 122 is ϕb, and the diameter of the image-side opening 114 isϕi, the following condition is satisfied: ϕb>ϕi. Therefore, it isfavorable for controlling the thickness of the plastic barrel 100 so asto avoid excessive thickness of partial plastic barrel 100. The surfacequality of the plastic barrel 100 would be unstable, such as flow markor surface white speckle, when the excessive thickness of partialplastic barrel 100 exists.

In the 1st embodiment, values of parameters ϕo, ϕi, ϕg, ϕb, ϕo/ϕi andϕg/ϕi are listed in Table 1.

TABLE 1 φo [mm] 2.11 φb [mm] 6.3 φi [mm] 5.7792 φo/φi 0.37 φg [mm] 6.57,6.91 φg/φi 1.14, 1.20 Note: The two values of φg in Table 1 are twicethe shortest distance between each of the gate traces 128a and 128b andthe central axis O of the plastic barrel 100, respectively.

2nd Embodiment

FIG. 9 is a three-dimensional view of a plastic barrel 200 according tothe 2nd embodiment of the present disclosure. FIG. 10 is anotherthree-dimensional view of the plastic barrel 200 of FIG. 9. FIG. 11 is atop view of the plastic barrel 200 of FIG. 9. FIG. 12 is a bottom viewof the plastic barrel 200 of FIG. 9. In FIG. 9 to FIG. 12, the plasticbarrel 200 includes an inner portion 210 and an outer portion 220. Theinner portion 210 defines an interior space 211, the inner portion 210includes, in order from an object side to an image side, an object-sideopening 212, a plurality of inner annular surfaces (its referencenumeral is omitted) and an image-side opening 214. The interior space211 is configured for accommodating the imaging lens assembly (as shownin FIG. 6), and the imaging lens assembly includes a plurality ofplastic lens elements.

The outer portion 220 surrounds the inner portion 210. The outer portion220 includes a mounting structure 221. According to the 2nd embodiment,the mounting structure 221 is illustrated with dots in FIG. 9 and FIG.10, which is for easily identifying the mounting structure 221 and themounting structure 221 is illustrated without dots in FIG. 11 to FIG.14. The mounting structure 221 is disposed on a surface 230 of the outerportion 220, and the mounting structure 221 is injection molded formounting a planar conductive element and a wiring element (as shown inFIG. 13 and FIG. 14). The mounting structure 221 includes at least threegate traces 228, the at least three gate traces 228 are located on asurface (its reference numeral is omitted) of the mounting structure221. When a diameter of the object-side opening 212 is ϕo, and adiameter of the image-side opening 214 is ϕi, the following condition issatisfied: 0.05<ϕo/ϕi<0.80.

With the aforementioned structure, it is favorable for simplifying theflow of the plastic material in a mold so as to reduce the difficulty ofinjection molding, and increase the yield rate and the productionefficiency.

In the 2nd embodiment, the plastic barrel 200 can be manufactured byinjection molding, and the plastic barrel 200 can be a black singlepiece plastic body which is integrally formed. Specifically, the innerportion 210 and the outer portion 220 are integrally formed on theplastic barrel 200, that is, the mounting structure 221 of the outerportion 220 is also integrally formed on the plastic barrel 200.According to the conventional autofocus module (not shown), whichprovides the lens assembly and the carrier being two independentcomponents, and the metal conductor components, such as the planarconductive element and the wiring element, being disposed on thecarrier. However, the plastic barrel of the present disclosure canaccommodate the imaging lens assembly and the metal conductor componentsat the same time. Therefore, the additional process of assembling theconventional lens assembly with the carrier can be omitted, and canavoid the pollution caused by the aforementioned assembling, and it isfavorable for improving the tolerance of the conventional assembling bythe precision of the mold design so as to improve the assemblingaccuracy.

In the 2nd embodiment, the aforementioned black single piece plasticbody can be blended with the chemical fiber or the glass fiber.Therefore, it is favorable for increasing the fluidity of the plasticmaterial so as to improve the molding quality, and when the glass fiberis blended, the structural strength of the plastic barrel 200 can beenhanced.

In the 2nd embodiment, the plastic barrel 200 can be a threadlessstructure. Therefore, the complexity of the mold design can be reducedby omitting the thread structure.

In FIG. 11 and FIG. 12, when the diameter of the object-side opening 212is ϕo, and the diameter of the image-side opening 214 is ϕi, thefollowing condition is satisfied: 0.10<ϕo/ϕi<0.60. Therefore, theplastic material in the mold can flow from peripheral region to theinner region along the radial direction, which is favorable for reducingthe disorder of the plastic material flow.

The mounting structure 221 can further include an annular groovestructure 222, the annular groove structure 222 is disposed on thesurface 230 of the outer portion 220. FIG. 13 is a three-dimensionalview of the plastic barrel 200 assembled to the planar conductiveelement 460 and the wiring element 470 of FIG. 9. FIG. 14 is anotherthree-dimensional view of the plastic barrel 200 assembled to the planarconductive element 460 and the wiring element 470 of FIG. 13. As shownin FIG. 13 and FIG. 14, the annular groove structure 222 can beinjection molded for mounting the wiring element 470, wherein the wiringelement 470 can be wound with a wire having an insulating outer layer,such as an enameled wire. Therefore, it is favorable for regularlyarranging the wiring element 470 on the outside of the plastic barrel200, so as to improve the focusing efficiency of electromagneticactuation. In the 2nd embodiment, the wiring element 470 is disposed inan assembling method to the annular groove structure 222.

In FIG. 10 and FIG. 14, the mounting structure 221 further includes afixing structure 227, the fixing structure 227 is adjacent to theannular groove structure 222, and the fixing structure 227 is injectionmolded for mounting the planar conductive element 460. Therefore, it isfavorable for stably assembling the planar conductive element 460 withthe plastic barrel 200 with the plastic barrel 200 without tilt. In the2nd embodiment, the planar conductive element 460 is an elastic memberhaving two spring pieces separated from each other. The planarconductive element 460 is disposed in the assembling method to thefixing structure 227.

In FIG. 10 and FIG. 14, the positions of the gate traces 228 in the 2ndembodiment would not affect the assembling between the mountingstructure 221 and the planar conductive element 460, and between themounting structure 221 and the wiring element 470. Therefore, it isfavorable for maintaining the compact size improving the molding qualityof the plastic barrel 200 by the positions of the gate traces 228.

In FIG. 9, FIG. 10 and FIG. 11, the annular groove structure 222includes an object-side side wall 223 and an image-side side wall 225,the object-side side wall 223 is disposed around the surface 230 of theouter portion 220, the image-side side wall 225 is disposed around thesurface 230 of the outer portion 220, the image-side side wall 225 iscorresponding to the object-side side wall 223, and the object-side sidewall 223 includes at least three notches 224. Therefore, it is favorablefor reducing the difficulty of the release by enhancing the smoothnessof the releasing step of the injection molding.

In FIG. 10, the fixing structure 227 is adjacent to the image-side sidewall 225 of the annular groove structure 222, and the image-side sidewall 225 has uneven thickness.

In FIG. 12, when twice a shortest distance between the gate traces 228and the central axis O of the plastic barrel 200 is ϕg, and the diameterof the image-side opening 214 is ϕi, the following condition issatisfied: 0.80<ϕg/ϕi<1.40. Therefore, the positions of the gate traces228 are close to the image-side opening 214, which can reduce thedisorder of the plastic material flow, so that the plastic material canbe naturally filled at the position near the image-side opening 214,rather than be pushed in a specific direction. Further, the followingcondition can be satisfied: 1.0<ϕg/ϕi<1.35. Therefore, it is favorablefor achieving a mold cavity design being smooth and without ruggedness.In the 2nd embodiment, the mounting structure 221 includes six gatetraces 228. The shortest distance between each of the gate traces 228and the central axis O of the plastic barrel 200 are equal. However, thepresent disclosure is not limited thereto. In other embodiments, thenumber and the position of gate traces can be adjusted on demand.

When the diameter of the bottom (its reference numeral is omitted) ofthe annular groove structure 222 is ϕb (as shown in FIG. 5), and thediameter of the image-side opening 214 is ϕi, the following condition issatisfied: ϕb>ϕi. Therefore, it is favorable for controlling thethickness of the plastic barrel 200 so as to avoid excessive thicknessof partial plastic barrel 200. The surface quality of the plastic barrel200 would be unstable, such as flow mark or surface white speckle, whenthe excessive thickness of partial plastic barrel 200 exists.

In the 2nd embodiment, values of parameters ϕo, ϕi, ϕg, ϕb, ϕo/ϕi andϕg/ϕi are listed in Table 2.

TABLE 2 φo [mm] 2.11 φb [mm] 6.3 φi [mm] 5.7792 φo/φi 0.37 φg [mm] 7.13φg/φi 1.23

3rd Embodiment

FIG. 15 is a three-dimensional view of a plastic barrel 300 according tothe 3rd embodiment of the present disclosure. FIG. 16 is a top view ofthe plastic barrel 300 of FIG. 15. FIG. 17 is a bottom view of theplastic barrel 300 of FIG. 15. The plastic barrel 300 includes an innerportion 310 and an outer portion 320. The inner portion 310 defines aninterior space 311, in order from an object side to an image side, anobject-side opening 312, a plurality of inner annular surfaces (itsreference numeral is omitted) and an image-side opening 314. Theinterior space 311 is configured for accommodating the imaging lensassembly (as shown in FIG. 6), and the imaging lens assembly includes aplurality of plastic lens elements.

The outer portion 320 surrounds the inner portion 310. The outer portion320 includes a mounting structure 321 and at least three gate traces328. According to the 3rd embodiment, the mounting structure 321 isillustrated with dots in FIG. 15, which is for easily identifying themounting structure 321 and the mounting structure 321 is illustratedwithout dot in FIG. 16 and FIG. 17. The mounting structure 321 isdisposed on a surface 330 of the outer portion 320, and the mountingstructure 321 is injection molded for mounting the planar conductiveelement and the wiring element (as shown in FIG. 13 and FIG. 14). Themounting structure 321 includes an annular groove structure 322, theannular groove structure 322 is disposed on the surface 330 of the outerportion 320, the annular groove structure 322 is injection molded formounting the wiring element (as shown in FIG. 13 and FIG. 14). When thediameter of the object-side opening 312 is ϕo, and the diameter of theimage-side opening 314 is ϕi, the following condition is satisfied:0.05<ϕo/ϕi<0.80.

With the aforementioned structure, it is favorable for simplifying theflow of the plastic material in a mold so as to reduce the difficulty ofinjection molding, and increase the yield rate and the productionefficiency.

In the 3rd embodiment, the plastic barrel 300 can be manufactured byinjection molding, and the plastic barrel 300 can be a black singlepiece plastic body which is integrally formed. Specifically, the innerportion 310 and the outer portion 320 are integrally formed on theplastic barrel 300, that is, the mounting structure 321 of the outerportion 320 is also integrally formed on the plastic barrel 300.According to the conventional autofocus module (not shown), whichprovides the lens assembly and the carrier being two independentcomponents, and the metal conductor components, such as the planarconductive element and the wiring element, being disposed on thecarrier. However, the plastic barrel of the present disclosure canaccommodate the imaging lens assembly and the metal conductor componentsat the same time. Therefore, the additional process of assembling theconventional lens assembly with the carrier can be omitted, and canavoid the pollution caused by the aforementioned assembling, and it isfavorable for improving the tolerance of the conventional assembling bythe precision of the mold design so as to improve the assemblingaccuracy.

In the 3rd embodiment, the black single piece plastic body can beblended with the chemical fiber or the glass fiber. Therefore, it isfavorable for increasing the fluidity of the plastic material so as toimprove the molding quality, and when the glass fiber is blended, thestructural strength of the plastic barrel 300 can be enhanced.

In the 3rd embodiment, the plastic barrel 300 can be a threadlessstructure. Therefore, the complexity of the mold design can be reducedby omitting the thread structure.

When the diameter of the object-side opening 312 is ϕo, and the diameterof the image-side opening 314 is ϕi, the following condition issatisfied: 0.10<ϕo/ϕi<0.60. Therefore, the plastic material in the moldcan flow from the peripheral region to the inner region along the radialdirection, which is favorable for reducing the disorder of the plasticmaterial flow.

In FIG. 17, the mounting structure 321 further includes a fixingstructure 327, the fixing structure 327 is adjacent to the annulargroove structure 322, and the fixing structure 327 is injection moldedfor mounting the planar conductive element (as shown in FIG. 13 and FIG.14). Therefore, it is favorable for stably assembling the planarconductive element with the plastic barrel 300 without tilt.

In FIG. 15 and FIG. 16, the positions of the gate traces 328 in the 3rdembodiment would not affect the assembling between the mountingstructure 321 and the planar conductive element, and between themounting structure 321 and the wiring element. Therefore, it isfavorable for maintaining the compact size improving the molding qualityof the plastic barrel 300 by the positions of the gate traces 328.

In FIG. 15, the annular groove structure 322 includes an object-sideside wall 323 and an image-side side wall 325, the object-side side wall323 is disposed around the surface 330 of the outer portion 320, theimage-side side wall 325 is disposed around the surface 330 of the outerportion 320, the image-side side wall 325 is corresponding to theobject-side side wall 323, and the object-side side wall 323 includes atleast three notches 324. Therefore, it is favorable for reducing thedifficulty of the release by enhancing the smoothness of the releasingstep of the injection molding.

In FIG. 15 and FIG. 17, the fixing structure 327 is adjacent to theimage-side side wall 325 of the annular groove structure 322, and theimage-side side wall 325 has uneven thickness.

In FIG. 16 and FIG. 17, when twice the shortest distance between each ofthe gate traces 328 and a central axis O of the plastic barrel 300 isϕg, and the diameter of the image-side opening 314 is ϕi, the followingcondition is satisfied: 0.80<ϕg/ϕi<1.40. Therefore, the positions of thegate traces 328 are close to the image-side opening 314, which canreduce the disorder of the plastic material flow, so that the plasticmaterial can be naturally filled at the position near the image-sideopening 314, rather than be pushed in a specific direction. Further, thefollowing condition can be satisfied: 1.0<ϕg/ϕi<1.35. Therefore, it isfavorable for achieving a mold cavity design being smooth and withoutruggedness. In the 3rd embodiment, the mounting structure 321 includesfour gate traces 328, the shortest distance between each of the gatetraces 328 and the central axis O of the plastic barrel 300 are equal.However, the present disclosure is not limited thereto. In otherembodiments, the number and the position of gate traces can be adjustedon demand.

When the diameter of the bottom (its reference numeral is omitted) ofthe annular groove structure 322 is ϕb (as shown FIG. 5), and thediameter of the image-side opening 314 is ϕi, the following condition issatisfied: ϕb>ϕi. Therefore, it is favorable for controlling thethickness of the plastic barrel 300 so as to avoid excessive thicknessof partial plastic barrel 300. The surface quality of the plastic barrel300 would be unstable, such as flow mark or surface white speckle, whenthe excessive thickness of partial plastic barrel 300 exists.

In the 3rd embodiment, values of parameters ϕo, ϕi, ϕg, ϕb, ϕo/ϕi andϕg/ϕi are listed in Table 3.

TABLE 3 φo [mm] 2.11 φb [mm] 6.3 φi [mm] 5.7792 φo/φi 0.37 φg [mm] 5.35φg/φi 0.93

4th Embodiment

FIG. 18 is a three-dimensional view of an autofocus module 400 accordingto the 4th embodiment of the present disclosure. FIG. 19 is anotherthree-dimensional view of the autofocus module 400 of FIG. 18. FIG. 20is an explored schematic view of the autofocus module 400 of FIG. 18.FIG. 21 is another explored schematic view of the autofocus module 400of FIG. 18. In FIG. 18 to FIG. 21, the autofocus module 400 includes aplastic barrel 100 and an imaging lens assembly 450, the imaging lensassembly 450 is disposed in an interior space 111 of the plastic barrel100 (as shown in FIG. 6). Therefore, when the plastic barrel 100 ismanufactured, it is favorable for simplifying the flow of the plasticmaterial in a mold so as to reduce the difficulty of injection moldingand increase the yield rate and the production efficiency.

In detail, the autofocus module 400 includes a metal yoke 420, a planarconductive element 430, a plurality of magnets 440, the plastic barrel100, a wiring element 470, the imaging lens assembly 450, a planarconductive element 460 and a holder 410. The metal yoke 420 is coupledto the holder 410 to form an accommodation space (its reference numeralis omitted) for the planar conductive element 430, the magnets 440, theplastic barrel 100, the wiring element 470, the imaging lens assembly450 and the planar conductive element 460 to be disposed therein. Theimaging lens assembly 450 includes six plastic lens elements, which are,in order from the object side to the image side, the plastic lenselement 451, the plastic lens element 452, the plastic lens element 453,the plastic lens element 454, the plastic lens element 455, and theplastic lens element 456, and the imaging lens assembly 450 furtherincludes the spacer element 457 a, the spacer element 457 b, the spacerelement 457 c and the spacer element 457 d, the spacer element 457 a isdisposed between the plastic lens element 452 and plastic lens element453, the spacer element 457 b is disposed between the plastic lenselement 453 and plastic lens element 454, the spacer element 457 c isdisposed between the plastic lens 454 element and plastic lens element455, the spacer element 457 d is disposed between the plastic lenselement 455 and plastic lens element 456. The planar conductive element460 includes two springs (its reference numeral is omitted) separatedfrom each other, and the two springs are arranged on a same horizontalplane. The details of the plastic barrel 100 are the same as theaforementioned description of the 1st embodiment, and will not bedescribed herein again.

In the 4th embodiment, the operation of the autofocus module 400 is asfollows. An electronic signal is obtained by the autofocus module 400according to the light entering into the imaging lens assembly 450 froman imaged object (not shown), and the electronic signal can be sent toan electronic driver (not shown), so that the electronic driver providesa driving current through the planar conductive element 460 to thewiring element 470, with an electromagnetic force generated by theinteraction of the magnets 440 and the wiring element 470. Thus, theplastic barrel 100 can be driven to move the imaging lens assembly 450along the direction parallel to the optical axis (not shown) so as toachieve the autofocus functionality. In the aforementioned focusingprocess, when the plastic barrel 100 is driven to move, a degree offreedom of the plastic barrel 100 along the direction parallel to theoptical axis can be provided by the planar conductive element 430 andthe planar conductive element 460. The planar conductive element 430 andthe planar conductive element 460 are deformed along the movement of theplastic barrel 100, and provide a restoring force to the plastic barrel100 when the plastic barrel 100 moves back to an initial positionthereof.

5th Embodiment

Please refer to FIG. 22, FIG. 23 and FIG. 24, FIG. 22 is a schematicview of an electronic device 10 according to the 5th embodiment of thepresent disclosure, FIG. 23 is another schematic view of the electronicdevice 10 of FIG. 22, and FIG. 24 is a block diagram of the electronicdevice 10 of FIG. 22, wherein FIG. 22 and FIG. 23 are schematic diagramof a camera in the electronic device 10, and FIG. 24 is the blockdiagram of the camera in the electronic device 10. In FIG. 22 and FIG.23, the electronic device 10 of the 5th embodiment is a smart phone, theelectronic device 10 includes a photographing system 15, wherein thephotographing system 15 includes an autofocus module 11 according to thepresent disclosure and an image sensor 13. The image sensor 13 isdisposed on an image surface (not shown) of the imaging lens assembly(its reference numeral is omitted) of the autofocus module 11 forreceiving an imaging light from the imaging lens assembly. Therefore, itis favorable for the miniaturization of the electronic device 10nowadays.

The electronic device 10 can further includes at least one sensingelement 16, at least one auxiliary optical component 17, an image signalprocessor (ISP) 18, an user interface 19, a circuit board 77 and aconnector 78, wherein the user interface 19 includes a touch screen 19 aand a button 19 b. Furthermore, the user activates the capturing mode bythe user interface 19 (the touch screen 19 a or the button 19 b) of theelectronic device 10. At this moment, the autofocus module 11 collectsimaging light on the image sensor 13 and outputs electronic signalsassociated with images to the image signal processor 18.

The auxiliary optical component 17 can be a flash module forcompensating color temperature, an infrared distance measurementcomponent, a laser focus module, etc. The sensing element 16 can havefunctions for sensing physical momentum and kinetic energy, such as anaccelerator, a gyroscope, a Hall Effect Element, to sense shaking orjitters applied by hands of the user or external environments.Accordingly, the functions of the autofocus module 11 of thephotographing system 15 can be enhanced to achieve the superior imagequality. Furthermore, the electronic device 10 according to the presentdisclosure can have a capturing function with multiple modes, such astaking optimized selfies, high dynamic range (HDR) under a low lightcondition, 4K resolution recording, etc. Additionally, the user canvisually see the captured image of the camera through the touch screen19 a and manually operate the view finding range on the touch screen 19a to achieve the autofocus function of what you see is what you get.

Furthermore, as shown in FIG. 23, the photographing system 15, thesensing element 16 and the auxiliary optical component 17 can bedisposed on the circuit board 77 (the circuit board 77 is a flexibleprinted circuit board, FPC) and electrically connected with theassociated components, such as the imaging signal processor 18, via theconnector 78 to perform a capturing process. Since current smart phoneshave a tendency of being compact, in the 5th embodiment, the way ofdisposing the photographing system 15 and related components on theflexible printed circuit board 77 and then integrating the circuitthereof into the main board of the electronic device 10 via theconnector 78 can satisfy the mechanical design of the limited spaceinside the electronic device 10 and the layout requirements and obtainmore margins. The autofocus function of the photographing system 15 canalso be controlled more flexibly via the touch screen 19 a of theelectronic device 10. In other embodiments (not shown herein), thesensing element 16 and the auxiliary optical component 17 can also bedisposed on the main board of the electronic device 10 or carrier boardsof other types according to requirements of the mechanical design andthe circuit layout.

In addition, the electronic device 10 can further include but not belimited to a wireless communication unit, a control unit, a storageunit, a random access memory (RAM), a read-only memory (ROM), or acombination thereof.

6th Embodiment

FIG. 25 is a schematic view of an electronic device 20 according to the6th embodiment of the present disclosure. As shown in FIG. 25, theelectronic device 20 of the 6th embodiment is a smart phone, wherein theelectronic device 20 includes a photographing system 21 a, aphotographing system 21 b and a photographing system 21 c. Thephotographing system 21 a includes an autofocus module 22 a and an imagesensor (not shown), the image sensor is disposed on an image surface(not shown) of the imaging lens assembly (its reference numeral isomitted) of the autofocus module 22 a for receiving an imaging lightfrom the imaging lens assembly. The photographing system 21 b includesan autofocus module 22 b and an image sensor (not shown), the imagesensor is disposed on an image surface (not shown) of the imaging lensassembly (its reference numeral is omitted) of the autofocus module 22 bfor receiving an imaging light from the imaging lens assembly. Thephotographing system 21 c includes an autofocus module 22 c and an imagesensor (not shown), the image sensor is disposed on an image surface(not shown) of the imaging lens assembly (its reference numeral isomitted) of the autofocus module 22 c for receiving an imaging lightfrom the imaging lens assembly.

Moreover, at least one of the autofocus module 22 a, the autofocusmodule 22 b and the autofocus module 22 c is the autofocus moduleaccording to the present disclosure, and the optical properties of theimaging lens assemblies of the autofocus module 22 a, the autofocusmodule 22 b and the autofocus module 22 c can be different. During thecapturing process of the electronic device 20, with the aid of anauxiliary optical component 27, three images can be obtained by thephotographing system 21 a, the photographing system 21 b and thephotographing system 21 c, and the desirable effects, such as a zoomeffect and an exquisite effect, can be provided by the processingelement (such as the imaging signal processor 28) of the electronicdevice 20.

The auxiliary optical component 27 can be the same as the auxiliaryoptical component 17 of the 5th embodiment, and which will not bedescribed herein.

The foregoing description, for purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTables show different data of the different embodiments; however, thedata of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. A plastic barrel, comprising: an inner portiondefining an interior space, wherein the inner portion comprises, inorder from an object side to an image side, an object-side opening, aplurality of inner annular surfaces and an image-side opening, theinterior space is configured for accommodating an imaging lens assembly,and the imaging lens assembly includes a plurality of plastic lenselements; and an outer portion surrounding the inner portion, whereinthe outer portion comprises a mounting structure, the mounting structureis disposed on a surface of the outer portion, the mounting structure isinjection molded for mounting a planar conductive element and a wiringelement, the mounting structure comprises at least three gate traces,and the at least three gate traces are located on a surface of themounting structure; wherein a diameter of the object-side opening is ϕo,a diameter of the image-side opening is ϕi, and the following conditionis satisfied:0.05<ϕo/ϕi<0.80.
 2. The plastic barrel of claim 1, wherein the plasticbarrel is manufactured by injection molding, and the plastic barrel is ablack single piece plastic body which is integrally formed.
 3. Theplastic barrel of claim 2, wherein the diameter of the object-sideopening is ϕo, the diameter of the image-side opening is ϕi, and thefollowing condition is satisfied:0.10<ϕo/ϕi<0.60.
 4. The plastic barrel of claim 2, wherein the mountingstructure further comprises an annular groove structure, the annulargroove structure is disposed on the surface of the outer portion, andthe annular groove structure is injection molded for mounting the wiringelement.
 5. The plastic barrel of claim 4, wherein the mountingstructure further comprises a fixing structure, the fixing structure isadjacent to the annular groove structure, and the fixing structure isinjection molded for mounting the planar conductive element.
 6. Theplastic barrel of claim 5, wherein the plastic barrel is a threadlessstructure.
 7. The plastic barrel of claim 2, wherein twice a shortestdistance between one of the gate traces and a central axis of theplastic barrel is ϕg, the diameter of the image-side opening is ϕi, andthe following condition is satisfied:0.80<ϕg/ϕi<1.40.
 8. The plastic barrel of claim 2, wherein twice ashortest distance between one of the gate traces and a central axis ofthe plastic barrel is ϕg, the diameter of the image-side opening is ϕi,and the following condition is satisfied:1.0<ϕg/ϕi<1.35.
 9. The plastic barrel of claim 2, wherein the blacksingle piece plastic body is blended with a chemical fiber or a glassfiber.
 10. The plastic barrel of claim 4, wherein the annular groovestructure comprises an object-side side wall and an image-side sidewall, the object-side side wall is disposed around the surface of theouter portion, the image-side side wall is corresponding to theobject-side side wall, and the object-side side wall comprises at leastthree notches.
 11. The plastic barrel of claim 4, wherein a diameter ofa bottom of the annular groove structure is ϕb, the diameter of theimage-side opening is ϕi, and the following condition is satisfied:ϕb>ϕi.
 12. An autofocus module, comprising: the plastic barrel of claim1; and the imaging lens assembly disposed in the interior space of theplastic barrel.
 13. An electronic device, comprising: the autofocusmodule of claim 12; and an image sensor disposed on an image surface ofthe imaging lens assembly.
 14. A plastic barrel, comprising: an innerportion defining an interior space, wherein the inner portion comprises,in order from an object side to an image side, an object-side opening, aplurality of inner annular surfaces and an image-side opening, theinterior space is configured for accommodating an imaging lens assembly,and the imaging lens assembly comprises a plurality of plastic lenselements; and an outer portion surrounding the inner portion, whereinthe outer portion comprises: a mounting structure disposed on a surfaceof the outer portion, wherein the mounting structure is injection moldedfor mounting a planar conductive element and a wiring element, themounting structure comprises an annular groove structure, the annulargroove structure is disposed on the surface of the outer portion, andthe annular groove structure is injection molded for mounting the wiringelement; and at least three gate traces, wherein the at least three gatetraces are closer to the object-side opening than the annular groovestructure to the object-side opening; wherein a diameter of theobject-side opening is ϕo, a diameter of the image-side opening is ϕi,and the following condition is satisfied:0.05<ϕo/ϕi<0.80.
 15. The plastic barrel of claim 14, wherein themounting structure further comprises a fixing structure, the fixingstructure is adjacent to the annular groove structure, and the fixingstructure is injection molded for mounting the planar conductiveelement.
 16. The plastic barrel of claim 15, wherein the annular groovestructure comprises an object-side side wall and an image-side sidewall, the object-side side wall is disposed around the surface of theouter portion, the image-side side wall is corresponding to theobject-side side wall, the fixing structure is adjacent to theimage-side side wall, and the image-side side wall has an uneventhickness.
 17. The plastic barrel of claim 14, wherein the plasticbarrel is a threadless structure.
 18. The plastic barrel of claim 14,wherein twice a shortest distance between one of the gate traces and acentral axis of the plastic barrel is ϕg, the diameter of the image-sideopening is ϕi, and the following condition is satisfied:0.80<ϕg/ϕi<1.40.
 19. The plastic barrel of claim 14, wherein the plasticbarrel is a black single piece plastic body, and the black single pieceplastic body is blended with a chemical fiber or a glass fiber.
 20. Theplastic barrel of claim 14, wherein the annular groove structurecomprises an object-side side wall and an image-side side wall, theobject-side side wall is disposed around the surface of the outerportion, the image-side side wall is corresponding to the object-sideside wall, and the object-side side wall comprises at least threenotches.
 21. The plastic barrel of claim 14, wherein a diameter of abottom of the annular groove structure is ϕb, the diameter of theimage-side opening is ϕi, and the following condition is satisfied:ϕb>ϕi.